SP Lifespan Extra Light 12 String 10-47 Phosphor Bronze (41MSP7600) – Since both plain and wound strings are treated with Cleartone technology, the new Martin SP Lifespan 12 string set will deliver a balanced sound that is sure to please.

SP Lifespan Baritone 14-17 Phosphor Bronze (41MSP7700) – With the recent and upcoming launch of several new C. F. Martin baritone guitars, Martin has designed these strings to be comfortable in both the traditional B tuning and modern C tuning, delivering a new standard in tone. Gauging is 14/20/30/42/54/70.

In addition to the new strings, Martin will also be running a promotion at their NAMM Booth called “The Great Martin String Challenge”.

The idea is that you will play two identical Martin guitars, one with their new strings, and one without them. If you can work out which guitar has the new SP Lifespan strings then you'll win a free set and some additional prizes.